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J. Kregenow, J. Edelstein, E.J. Korpela, C. Heiles (SSL, UC Berkeley), K.W. Min, K.S. Ryu (SaTReC, KAIST), U.W. Nam, K.I. Seon, J.H. Park, H. Jin (Korea Astronomical Observatory), Space Sciences Lab, Space Astrophysics Group SPEAR Team, Korea Advanced Institute of Technology FIMS Team, Korea Astronomy Observatory FIMS Team
We present observations of far ultraviolet emission from the Orion-Eridanus superbubble taken with the SPEAR (Spectroscopy of Plasma Evolution from Astrophysical Radiation) instrument on the STSAT-1 satellite. Nearby and only moderately evolved, the Eridanus superbubble is a large cavity in the ISM created by the stellar winds and supernova explosions from an Orion O/B stellar association interacting with the surrounding local material. The Eridanus bubble is a rich science target because this particular object has a complex structure, including shocks and asymmetries, which results in a variety of interacting phases of interstellar gas.
SPEAR, also known as FIMS, is an imaging far-UV spectrometer with bandpasses of 900-1150 and 1350-1725 Angstroms, spectral resolution of ~500, and imaging resolution of ~10 arcminutes. SPEAR's wavelength regime includes many important atomic and molecular lines including Oxygen, Nitrogen, Hydrogen, and Sulfur. We have detected of a number of these species in Eridanus. SPEAR began science observations in late 2003 and observed a variety of demonstration targets during commissioning, including Eridanus. We present early results from observations of several different targets within this extended object including preliminary spectra and an examination of spatial dependence in composition.
The SPEAR payload is supported in part by the NASA Research Carriers grant NAG5-5335. The STSAT-1 Mission is supported by the Korea Ministry of Science and Technology.
The author(s) of this abstract have provided an email address for comments about the abstract: kregenow@ssl.berkeley.edu
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Bulletin of the American Astronomical Society, 36 #2
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